...That the Security suddenly realized it would not be a good idea to
incite a riot. My guess is that it was John Travolta himself, and not
Security, that decided a mob action would not be a good idea.

Now I've looked at the above film clip, I can't be sure, be it seemed
to me that there were Scientologists mixed in with the fans. Having
been a 10+ year member of scientology, I recognize a lot of them when
I see them.

Assuming a mob action had occurred, and if the picketers had been
harmed, the media would have had to report that fans of John Travolta,
and some of his friends in the Church, had beaten up some picketers at
an opening event.

Even if the newspapers, out of professional courtesy, or out of fear,
did not report properly on the incident, the word would still get out
among the little people. Do not talk bad about scientology around
John Travolta, the scientologists will beat you up.

There will be more pickets around John Travolta, and possibly
Tom Cruise. Gentlemen, you would do well to make sure that no riots
occur, that nobody picketing you gets hurt. If it happens, besides
the fans, I assure you, scientologists will have been among the
guilty, among the rioting mob.

Besides, the official PR line is that Scientology endorses Free
Speech. In public it is a good idea to at least pretend this.